A very active pattern was in place over the central U.S.  During the previous night, a strong short wave lifted northeast across the area, setting off a round of thunderstorms.  The thunderstorms moved northeast of the area by afternoon with a large area of subsidence moving into Iowa.  This allowed the atmosphere to recover during the afternoon.  An upper level closed low pressure area was positioned over western and central Nebraska during the afternoon and evening hours.  The low lifted northeast as a surface dry line extending south from the low advanced east across Kansas.  The airmass was quite unstable with lifted indices around -8 C. by late afternoon and mixed layer CAPE values in the 3000 to 4000 J/kg range.  The freezing level at the beginning of the event was around 14,000 feet.  Thunderstorms became tornadic to the southwest of Iowa during the late afternoon.  One of the storms produced a tornado in northern Missouri which crossed into Ringgold County.  The tornado passed through farm fields for about a mile before lifting.  Little damage resulted.  The storms moved in to south central Iowa and produced some very large hail.  Softball size hail fell during the early stages of the event in Ringgold County, with baseball size hail in Decatur County.  As the system moved northeast, hail sizes decreased and the event turned into more of a wind event.   There were several reports of 55 to 65 MPH winds received as the line lifted northeast.  Some damage occurred, however the damage was not widespread.

Thunderstorm Wind in WAYNE, IOWA
From 04-JUN-05 19:45:00 to 04-JUN-05 19:45:00 (CST)
Location: CORYDON
Magnitude: 52 EG
Property damage: 5K
Reported by: EMERGENCY MANAGER

Thunderstorm Wind in MARION, IOWA
From 04-JUN-05 20:15:00 to 04-JUN-05 20:15:00 (CST)
Location: KNOXVILLE
Magnitude: 57 EG
Property damage: 10K
Reported by: TRAINED SPOTTER

Hail in WAYNE, IOWA
From 04-JUN-05 20:15:00 to 04-JUN-05 20:15:00 (CST)
Location: HUMESTON
Magnitude: 1.00 
Property damage: 5K
Crop damage: 5K
Reported by: EMERGENCY MANAGER

Thunderstorm Wind in JASPER, IOWA
From 04-JUN-05 20:49:00 to 04-JUN-05 20:49:00 (CST)
Location: NEWTON
Magnitude: 57 EG
Property damage: 5K
Reported by: TRAINED SPOTTER

Thunderstorm Wind in DECATUR, IOWA
From 04-JUN-05 19:05:00 to 04-JUN-05 19:05:00 (CST)
Location: GARDEN GROVE
Magnitude: 52 EG
Property damage: 1K
Reported by: TRAINED SPOTTER

Hail in CLARKE, IOWA
From 04-JUN-05 19:20:00 to 04-JUN-05 19:20:00 (CST)
Location: OSCEOLA
Magnitude: 0.88 
Property damage: 2K
Crop damage: 5K
Reported by: TRAINED SPOTTER

Hail in POWESHIEK, IOWA
From 04-JUN-05 19:47:00 to 04-JUN-05 19:47:00 (CST)
Location: GRINNELL
Magnitude: 0.88 
Property damage: 1K
Crop damage: 1K
Reported by: AMATEUR RADIO

Thunderstorm Wind in WARREN, IOWA
From 04-JUN-05 19:49:00 to 04-JUN-05 19:49:00 (CST)
Location: NEW VIRGINIA
Magnitude: 52 EG
Property damage: 1K
Reported by: LAW ENFORCEMENT

Thunderstorm Wind in MAHASKA, IOWA
From 04-JUN-05 21:00:00 to 04-JUN-05 21:00:00 (CST)
Location: FREMONT
Magnitude: 50 EG
Property damage: 2K
Reported by: EMERGENCY MANAGER

Hail in RINGGOLD, IOWA
From 04-JUN-05 18:20:00 to 04-JUN-05 18:20:00 (CST)
Location: KELLERTON
Magnitude: 4.50 
Property damage: 20K
Crop damage: 20K
Reported by: LAW ENFORCEMENT

Hail in RINGGOLD, IOWA
From 04-JUN-05 18:20:00 to 04-JUN-05 18:20:00 (CST)
Location: MT AYR
Magnitude: 1.00 
Property damage: 5K
Crop damage: 2K
Reported by: LAW ENFORCEMENT

Thunderstorm Wind in MAHASKA, IOWA
From 04-JUN-05 20:45:00 to 04-JUN-05 20:45:00 (CST)
Location: NEW SHARON
Magnitude: 50 EG
Property damage: 2K
Reported by: EMERGENCY MANAGER

Hail in POWESHIEK, IOWA
From 04-JUN-05 19:35:00 to 04-JUN-05 19:35:00 (CST)
Location: GRINNELL
Magnitude: 1.00 
Property damage: 5K
Crop damage: 1K
Reported by: LAW ENFORCEMENT

Thunderstorm Wind in TAMA, IOWA
From 04-JUN-05 21:20:00 to 04-JUN-05 21:20:00 (CST)
Location: TOLEDO
Magnitude: 52 EG
Property damage: 2K
Reported by: LAW ENFORCEMENT

Thunderstorm Wind in MARSHALL, IOWA
From 04-JUN-05 21:13:00 to 04-JUN-05 21:13:00 (CST)
Location: LAUREL
Magnitude: 52 EG
Property damage: 5K
Reported by: LAW ENFORCEMENT

Thunderstorm Wind in MARION, IOWA
From 04-JUN-05 20:14:00 to 04-JUN-05 20:14:00 (CST)
Location: KNOXVILLE
Magnitude: 53 MG
Property damage: 2K
Reported by: AWOS,ASOS,MESONET,ETC

Thunderstorm Wind in TAMA, IOWA
From 04-JUN-05 21:25:00 to 04-JUN-05 21:25:00 (CST)
Location: CLUTIER
Magnitude: 50 EG
Property damage: 2K
Reported by: LAW ENFORCEMENT

Thunderstorm Wind in BREMER, IOWA
From 04-JUN-05 22:15:00 to 04-JUN-05 22:15:00 (CST)
Location: PLAINFIELD
Magnitude: 52 EG
Property damage: 5K
Reported by: GENERAL PUBLIC

Thunderstorm Wind in JASPER, IOWA
From 04-JUN-05 20:26:00 to 04-JUN-05 20:26:00 (CST)
Location: PRAIRIE CITY
Magnitude: 52 EG
Property damage: 3K
Reported by: TRAINED SPOTTER

Thunderstorm Wind in APPANOOSE, IOWA
From 04-JUN-05 20:40:00 to 04-JUN-05 20:40:00 (CST)
Location: CENTERVILLE
Magnitude: 57 EG
Property damage: 10K
Reported by: LAW ENFORCEMENT

Thunderstorm Wind in POLK, IOWA
From 04-JUN-05 19:50:00 to 04-JUN-05 19:50:00 (CST)
Location: DES MOINES ARPT
Magnitude: 52 EG
Property damage: 1K
Reported by: FIRE DEPT/RESCUE SQUAD

Thunderstorm Wind in WARREN, IOWA
From 04-JUN-05 19:57:00 to 04-JUN-05 19:57:00 (CST)
Location: NORWALK
Magnitude: 55 EG
Property damage: 3K
Reported by: TRAINED SPOTTER

Thunderstorm Wind in LUCAS, IOWA
From 04-JUN-05 19:57:00 to 04-JUN-05 19:57:00 (CST)
Location: CHARITON MUNI ARPT
Magnitude: 52 MG
Property damage: 2K
Reported by: AWOS,ASOS,MESONET,ETC

Hail in JASPER, IOWA
From 04-JUN-05 19:03:00 to 04-JUN-05 19:03:00 (CST)
Location: REASNOR
Magnitude: 0.88 
Property damage: 1K
Crop damage: 5K
Reported by: LAW ENFORCEMENT

Tornado in RINGGOLD, IOWA
From 04-JUN-05 18:15:00 to 04-JUN-05 18:17:00 (CST)
Location: MT AYR
Tornado F-scale: F1
Crop damage: 5K
Reported by: NWS STORM SURVEY

Tornado crossed into Iowa from Harrision County, MO and passed across a few farm fields before lifting.

Hail in DECATUR, IOWA
From 04-JUN-05 18:52:00 to 04-JUN-05 18:52:00 (CST)
Location: GRAND RIVER
Magnitude: 2.75 
Property damage: 25K
Crop damage: 30K
Reported by: LAW ENFORCEMENT

Thunderstorm Wind in JASPER, IOWA
From 04-JUN-05 20:45:00 to 04-JUN-05 20:45:00 (CST)
Location: NEWTON
Magnitude: 50 EG
Property damage: 1K
Reported by: LAW ENFORCEMENT

Hail in DECATUR, IOWA
From 04-JUN-05 19:06:00 to 04-JUN-05 19:06:00 (CST)
Location: DAVIS CITY
Magnitude: 0.75 
Crop damage: 5K
Reported by: TRAINED SPOTTER

Hail in DECATUR, IOWA
From 04-JUN-05 19:00:00 to 04-JUN-05 19:00:00 (CST)
Location: LEON
Magnitude: 1.00 
Property damage: 5K
Crop damage: 2K
Reported by: AMATEUR RADIO

Thunderstorm Wind in POWESHIEK, IOWA
From 04-JUN-05 21:10:00 to 04-JUN-05 21:20:00 (CST)
Location: MONTEZUMA
Magnitude: 50 EG
Property damage: 5K
Reported by: LAW ENFORCEMENT

Thunderstorm Wind in BREMER, IOWA
From 04-JUN-05 22:12:00 to 04-JUN-05 22:12:00 (CST)
Location: PLAINFIELD
Magnitude: 52 EG
Property damage: 2K
Reported by: TRAINED SPOTTER

Thunderstorm Wind in JASPER, IOWA
From 04-JUN-05 20:35:00 to 04-JUN-05 20:35:00 (CST)
Location: NEWTON
Magnitude: 55 EG
Property damage: 5K
Reported by: EMERGENCY MANAGER

Thunderstorm Wind in MARION, IOWA
From 04-JUN-05 20:36:00 to 04-JUN-05 20:36:00 (CST)
Location: PELLA
Magnitude: 52 MG
Property damage: 1K
Reported by: AWOS,ASOS,MESONET,ETC